Jersey client: How to add a list as query parameter

Question

I'm creating a Jersey client for a GET service that has a List as query parameter. According to the documentation, it's possible to have a List as a query parameter (this information is also at @QueryParam javadoc), check it out: In general the Java type of the method parameter may: - Be a primitive type; - Have a constructor that accepts a single String argument; - Have a static method named valueOf or fromString that accepts a single String argument (see, for example, Integer.valueOf(String) and java.util.UUID.fromString(String)); or - Be List, Set or SortedSet, where T satisfies 2 or 3 above. The resulting collection is read-only. Sometimes parameters may contain more than one value for the same name. If this is the case then types in 4) may be used to obtain all values. However, I can't figure out how to add a List query parameter using Jersey client. I understand alternative solutions are: - Use POST instead of GET; - Transform the List into a JSON string and pass it to the servi…

Accepted Answer

`@GET` does support List of Strings

Setup: Java : 1.7 Jersey version : 1.9

Resource

```
@Path("/v1/test")
```

Subresource:

```
// receive List of Strings
@GET
@Path("/receiveListOfStrings")
public Response receiveListOfStrings(@QueryParam("list") final List<String> list){
    log.info("receieved list of size="+list.size());
    return Response.ok().build();
}
```

Jersey testcase

```
@Test
public void testReceiveListOfStrings() throws Exception {
    WebResource webResource = resource();
    ClientResponse responseMsg = webResource.path("/v1/test/receiveListOfStrings")
            .queryParam("list", "one")
            .queryParam("list", "two")
            .queryParam("list", "three")
            .get(ClientResponse.class);
    Assert.assertEquals(200, responseMsg.getStatus());
}
```

Jersey client: How to add a list as query parameter

Solution

Problem